Events happening as part of Sept. 11 anniversary

The families of those who lost loved ones on Sept. 11, elected officials and other public figures will mark the 11th anniversary of the attacks on Tuesday. Some of the events:

New York City:

8:39 a.m. Eastern — Program begins at the National September 11 Memorial Plaza at the World Trade Center site, with bagpipers and drummers. The Young People's Chorus of New York City sings the National Anthem.

8:46 a.m. — Moment of silence marking when American Airlines Flight 11 hit the north tower, and houses of worship toll their bells. Then family members will read the names of those killed.

9:03 a.m. — Moment of silence marking when United Airlines Flight 175 hit the south tower.

12:30 p.m. — Program finishes with another choral performance and three trumpeters performing taps.

Sunset — The "Tribute in Light" art installation is turned on until dawn Wednesday.

8 p.m. — National September 11 Memorial closes.

Washington, D.C.:

President Barack Obama, first lady Michelle Obama and the White House staff mark a moment of silence on the south lawn of the White House. The president and the first lady attend a Sept. 11 memorial event at the Pentagon and visit service members at the Walter Reed National Military Medical Center in Bethesda, Md.